Stemar Long Test Balls are designed to be installed through a cleanout or floor drain and seal both sides of the wye for a sewer air test.


Molded sealing ribs at each end of the plug ensure a leak-free seal, and the top side of the plug will inflate before the bottom preventing possible backsplash during your waste stack test.

Stemar Long Test Balls, manufactured by Cherne Industries, are proudly made in the USA with 100% natural rubber.

Also known as: wye plugs, donkey plugs

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Long Test Ball Specifications

Low Pressure Safety Instructions

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Long Test Balls